protected function BookManager::findChildrenRelativeDepth in Drupal 9

Same name and namespace in other branches

1. 8 core/modules/book/src/BookManager.php \Drupal\book\BookManager::findChildrenRelativeDepth()

Determine the relative depth of the children of a given book link.

Parameters

array $book_link: The book link.

Return value

int The difference between the max depth in the book tree and the depth of the passed book link.

1 call to BookManager::findChildrenRelativeDepth()

BookManager::getParentDepthLimit in core/modules/book/src/BookManager.php

Finds the depth limit for items in the parent select.

File

core/modules/book/src/BookManager.php, line 221

Class

BookManager

Defines a book manager.

Namespace

Drupal\book

Code

protected function findChildrenRelativeDepth(array $book_link) {
  $max_depth = $this->bookOutlineStorage
    ->getChildRelativeDepth($book_link, static::BOOK_MAX_DEPTH);
  return $max_depth > $book_link['depth'] ? $max_depth - $book_link['depth'] : 0;
}